Shirt collar



FIG. 1 is a perspective view of a shirt collar in full lines with a shirt shown in broken lines representing environmental association matter being for illustrative purposes only and forming no part of the claimed invention;

FIG. 2 is a front elevational view of the shirt collar;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view of the shirt collar; and,

FIG. 6 is a left side elevational view thereof, the right side view being a mirror image of the right side view. 

The ornamental design for a shirt collar, as shown and described. 